Nike Dri-FIT ADV Unstructured Cooling Cap (2 Sizes)Nike Fly Dri FIT ADV Unstructured Cooling Cap Built to handle the heat, this low depth Fly cap takes cooling to another level. Nike AeroAdapt panels on the top have sweat activated vents to help keep you comfortable. Plus, we added pockets along the crown that store molded ice cubes, creating the ultimate air conditioning. Cooling System Three included silicone ice molds let you create strategically shaped cubes that fit within front and side pockets.